In 10 appearances (nine as a reliever) this season, Pomeranz has a 2-1 record and 1.45 ERA. He has limited opponents to 13 hits in 18 2/3 innings.

Manager Bob Melvinsaid the lefty "has pitched his way into this role. It's difficult to be that long guy; you're not getting regular work, but each and every time we've called on him, he's done a good job."

Straily (1-2, 4.93) gave up three runs on three hits in six innings in a no-decision against Seattle on Wednesday. Melvin mentioned Straily's previous start, a 7-1 loss at Boston during which he threw first-pitch strikes to only three of 20 hitters, as evidence that the right-hander needs to refine his "fastball command."

Melvin also noted that Straily's velocity has dipped, "but that's not the biggest concern. His concern is getting ahead" of hitters.

Cook departed Wednesday's opener after throwing two sliders on which he "felt tightness that was limiting my range of motion," he said Friday. An MRI exam Thursday revealed "nothing more than a forearm strain," Cook said.

Rodriguez, 29, who had Tommy John surgery in March 2013, pitched a shutout ninth Friday. He was 1-0 with one earned run allowed in 12 1/3 innings with Sacramento. The A's acquired him from Houston in the deal that brought Jed Lowrieto Oakland in February 2013.

This February, the A's claimed Savery, a 28-year-old lefty, off waivers from Philadelphia. He was 4-0 with a 3.86 ERA in 10 appearances with the River Cats.